He was a divorce lawyer. He knew she’d take him to the cleaners if he got rid of her legally.
So he was so worried about his wife taking his money that he shot her and himself? If he wanted to be rid of her, it would make some sense to murder her. Suicide doesn’t make sense if being “taken to the cleaners” was his primary concern.
This was clearly a mental health problem. Whatever problems they had were temporary and fixable. This guy decided on a permanent solution instead. Sicko needed to be locked up.